Centrifugal fan separator



ch w. M. BARKER CENTRIFUGAL FAN SEPARATOR 2 Sheets-Sheet 1 Filed Feb. 24, 1925 1,616,566 F 1927- w. M. BARKER CENTRIFUGAL FAN sBPARAToR' Filed Feb. 24', 1925 2 Sheets-Sheet 2 ll /yflazhv t; 3%., MM

WILLIAM M. BARKER, OF CANTON, OHIO.

CENTRIFUGAL FAN SEPARATOR. Application filed February'2 1, 1925. Serial No. 11,302. I

The invention relates to centrifugal fans rected upward or downward or laterally used for exhausting or conveying pulverized either way from the top or bottom of a fan materlal from a grinding mill or other operating on a horizontal axis, or may lead source of supply; and the object of the improvement is to utilize the action of the fan for separating the material into different degrees of fineness as well as for impelling the same.

In the operation of a centrifugal fan for impelling pulverized material suspended in the air, it has been found that the centrifcombined directly with grinding apparatus,

such for instance as a. grinding or pulverizing mill, and when so combined the unobstructed air-way delivery channel carrying the coarser material can lead to a hopper or ugal action of the fan wheel throws the other means for feeding back intothe mill larger particles of the material outward for regrinding while the unobstructed airagainst the peripheral wall of the casing, way delivery channel carrying finer material,

while the smaller particles are not thrown can lead to a hopper or other means for outward as far, so that there is a segregastorage or disposal.

tion of different grades offineness of the Such an embodiment of the invention is material in spiral zones, before the same is illustrated, without being limited thereto, in

discharged through the outlet mouth of the the accompanying drawings, forming part casing. hereof, in which The present invention involves the divi- Figure 1 is a sectional view, normal to the sion of the discharge way in the throat of axis of the centrifugal fan separator;- the outlet mouth of the fan easing, into two Fig. 2, a side elevation of the same comseparate unobstructed air-way delivery cha11 bined with a ball mill; and nels, the one leading tangentially from the Fig. 3, an edge elevation of the'same. outer or peripheral portion of the outlet, and Similar numerals refer to similar parts the'other leading tangentially from an inthroughout the drawings. termediate or inner portion thereof; so that A centrifugal fan wheel 4 is mounted in a the coarser material which is segregated to spiral casing 5 so as to form a peripheral and discharged from the outer portion of the channel 6 gradually increasing in radial. outlet will flow through the one air-way depth to the outlet opening? of the casing. channel, and the finer material which is dis- The throat of the discharge way 8 leading charged from an inner portion of the outlet from the outlet mouth 7 is formed by a will flow through the other air-way channel. tubular wall extension from the peripheral At the point of division it is preferred to wall of the casing, the outer extension bein provide an adjustable dividing or splitting substantially tangential to the periphera blade inthe throat of the outlet mouth, wall of the cas1ng,'and the throat of the distransversely fulcrumed at its rear edge at charge way is divided into two unobstructed the junction of the adjacent walls of the air-way delivery channels 8' and 8 by suitchannels, and thence tapered forward to its able walls 9' and 9" interposed between the free edge, so that the same may be swung extension walls 9. outward and inward toward and from the A dividing blade 10 is preferably properipheral wall of the casing at the outlet vided across the throat of the dlscharge way i thereof, for dividing the material flowing 8, one edge of which is fulcrumed at 10' at through the outlet according to the different the junction of the dividing walls of the spiral zones into which the same has been delivery channels, and the other free edge se egated. 10 islocated in the mouth of the outlet he centrifugal fan separator may be opening of the fan casin parallel with the used in any position Where it is desired to axisof the fan, soas to 'vide the material impel pulverized material without regard to laden air as it flows outward through the the direction into which the delivery is made, throat of the same. for the reason the separation is effected by A suitable crank arm 11 is connected with the action of centrifugal force as distinthe fulcrum of the dividing blade external guished from the action of gravity; and the to the casing, for adjusting the same in variunobstructed air-way delivery channels ous positions and suitable means as a leading from the fan separator can be dispring-detent 12 and a cooperating s gment form a spiral zone along the periphery of the wheel, as illustrated in the drawings; and as the material laden air, thus segregated into spiral zones of difl'erential sizes,

ows through the outlet opening of the casings, it isdivided and directed into the respective unobstructed air-wa delivery channels by which the difierent size material and the air carrying the same are conducted away from the fan separator.

A suitable adjustment of blade serves to control the difference in the size of the material which is conducted by the air current into and throughthe respective delivery channels; and in this manner, a separation of the coarser from the finer particles of the pulverized material flowing with the air currents, is effected directly by the action of the fan and the dividing blade located in the throat of the outlet mouth thereof.

' As shown in Figs. 2 and 3 the fan separator 5 may be mounted to receive pulverized material directly from a ball mill 14, and in this use of the apparatus the unobstructed delivery pipe 83" for the air current carrying the coarser material may discharge into a hopper 15 leading into the feed pipe 16 of the ball mill for regrinding the coarser material; and the unobstructed delivery pipe 8"" for the air current which the dividing carries the finer material, may discharge the same into a hopper 17 for storage or other disposition.

I claim 1. A fan separator including a centrifugal wheel, a. spiral casin for the wheel receiving pulverizedmaterial and having an outlet mouth and a discharge throat attached to and leading tangentially therefrom, and a blade in and carried by the Walls of the discharge throat and parallel with the axis of the fan dividing the discharge throat into a plurality of separate unobstructed air-way delivery channels for the flowing air which carries different size material through the respective channels.

2. A fan separator including a centrifugal wheel, a spiral casing for the wheel receiving pulverized material having an outlet mouth and a discharge throat attached to and leading tangentially therefrom, and a blade in and carried by the walls of the discharge throat and parallel. with the axis of the fan dividing the discharge throat into outer and inner unobstructed delivery channels for the flowing air which carries different size material through the respective I channels.

3. A fan separator including a centrifugal Wheel, a spiral casing for the wheel receiving pulverized material having an outlet mouth and a discharge throat leading tangentially therefrom, and an adjustable bladein the' discharge throat dividing the discharge throat into a plurality of separate unobstructed air-way delivery channels 'fOI" the 'flowing air which carries diiferent. size material through the respective channels.

In testimony that I claim the above, I have hereunto subscribed my name.

WILLIAM M. BARKER. 

